精品文档java面向对象习题

} public class NewSuper extends SuperEx { public NewSuper(String a,String b) { super(a,b); } public static void main(String args []) { SuperEx a = new SuperEx(\ SuperEx b = new NewSuper(\ a.aMethod(); b.aMethod(); } public void aMethod() { System.out.println(\ } } 1) The following is displayed: r:Hi s:Hi 2) Compiler error at the line \ 3) The following is displayed: r:Hi r:Hi s:Bart 4) The following is displayed r:Hi s:Tom r:Hi s:Bart String s= \s.concat(\s.replace('C','F'); System.out.println(s); What will be printed out? A. Compilation Error says that String is immutable B. ABFDE C. ABCDE D. ABCD class A { public int getNumber(int a) {

return a + 1; } } class B extends A { public int getNumber (int a) { return a + 2 } public static void main (String args[]) { A a = new B(); System.out.printIn(a.getNumber(0)); }} What is the result? A. Compilation succeeds and 1 is printed. B. Compilation succeeds and 2 is printed. C. An error at line 8 causes compilation to fail. D. An error at line 13 causes compilation to fail. E. An error at line 14 causes compilation to fail.

编写简单工厂模式

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编写类似DAO模式的程序

练习编写二叉树， 使用前，中，后序遍历树。

写一个计算器的接口

从键盘输入字符串，回车后反转打印

假设字符串类似这样的aba和aab就相等，现在随便给你二组字符串，请编程比较他们看是否相等

从键盘输入字符串，回车后按单词反转 Where there is a way Way a is there where

从键盘读入几个数，打印最小的那个

编程显示某一文件目录下的文件名

给你一组字符串如：iu7i8hy4jnb2，让你编程输出里面的数字：7842

写一个代码片断统计一个字符串中出现的字符及其个数，例如对于字符串“abcaaabcd”，统计的结果是： a（4个）b（2个）c（2个）d（1个）

匹配英文字母组成的字符串(不区分大小写): 匹配ip地址:

匹配数字个数限制（此为6个数字）

IO

编程文件Copy程序

一个文本文件中约有10万多行的数据，每个数据占一行(数据为一个整数)。要求：统计出总行数，并找出出现次数最多的那个整数。